Piston



. July l17, 1923. 41,462,084

J. W. CORSER PIsToN Filed May 16. 1921 A TTORNEYS.

Patented July 17, 1923.

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rrsToN'.' i i application nied'may 1e, 1921..ise'ria1'N0.{47o,14s. 5

T @Zwamamayememf. i Be it known that-LJO'HN W. Corsair, a citizen of theUnited States, .andi resident of Los Angeles, in the county of LosyAngeles,l State of California, have invented new and useful Improvementsin a Piston,

- of which the following is a specification.

. comes in contact therewith.

It is anobject of this invention to provide a piston having a head ofsuch character that heat is not readily conducted through the head, andto this end the head is heat insulated. Another object of this inventionis to provide a removable wrist pin bearing ring which does not require.the shell of the piston to be bored through and permits the use ofremovable bushings. In addition to the broader objects of thisinvention, there are certain details of design whereby a light weighthigh speed piston of durable and simple construction is secured.

These objects together with other objects and correspondingaccomplishments are obtained by means of the embodiment of my inventionillustrated in the accompanying drawing, in which: y

Fig. 1 is a perspective view partly in section showinglthe piston partsassembled; Fig. 2 is a perspective View of the wrist pin ring withfragments brokenout and shown in section; Fig. 3 is a perspective. viewof a. fragment of thewrist pin ring showing a novel lock for holdingthebolts against turning; and Fig. L1 is a perspective view of the bushingsused with my wrist pin rings( Referring more particularly to the drawingand especially to Fig. 1, the skirt of the piston 5 is shown provided atthe end ad- -jacent the head with the usual grooves 6 to receive pistonrings. The skirt has no openings therethrough. The head is formed with acircular recess 7, undercut atthe periphery.

Disposed in the recess is a heat insulating i composition 8. Suchcompositions are well lknown in the mechanical arts, and it isconvenient to use a plastic composition which eventually sets. Formed onthe internal wall of the piston skirt are lugs 9, which are bored andthreaded to receive bolts.

lThe wrist pin ring may be of a light weight metal such as aluminum. Itcondisk 19.

kSegments for. .bearings kindicated by' 11'` exsists of acylindricalhollow bodyy portion 10'.

tend yacross-the wrist, pin rlng and arepro'- vided: with alignedopenings 12 'to receive bushings 13.` These bushingsarepreferably ofbronze. The bearing segments and ring body are slit transverse the axisof the cylinder asindicated by 14 to provide for clamping the bushingsin place and are provided with bolt holes 15 which may be registeredwith the bolt holes in the lugs 9. Bolts 16 are placed therein to securethe wrist pin ring to the lugs and in position von the piston body. Inorder to lock the bolts against turning, I have provided a strip ofsheet metal 17 having openings for the bolts to extend therethrough andprovided 'with spurs 18. The yspurs may be turned up against the head ofthe bolts as indicated in Fig. 3, locking the latter against turning.

In order to enclose the ,top yof the piston above the wrist 'pin ring Ihave provided a This forms an airfchamber further insulating the top orthe head of the piston from the `lubricant below. I

It isobvious that the piston will not be deformed by yreason of thestrain of the wrist pin, as would be the case where the skirt of thelpiston is bored through. The bolts 16 act to hold the wrist pin ring inplace and at the same time to lock the bushings in position. It isobvious that as the bushings become worn, the wrist pin ring may beremoved and new ones inserted. Any lubricant which comes in contact withthe top of the piston, where the disk is not used, or in contact ywiththe disk will not be heated to the point that carbonization occurs.llVithy engines of this character, in which no provision is `made toprevent burning of the lubricant, the latter is carbonized, breakingdown the lubricant and'causing a serious decrease in efficiency. Theassembling and disassembling of the piston is easily effected, requiringa minimumof skill. n

supporting vrrreafxis ,whereby to. -attach said ring to Sald supportingmeans and contract said openings for locking the bushings in place. l i

2. A piston comprising an" imperforate skirt and a head, a Wrist pinring'having aligned bushing openings and slits extending peripherallyacrossy said: openings to allow for contracting them, said skirt havinginner supporting. rmeans for, attachment thereto of 'said ring7 bushingsin said openings, and' bolts extending through said ring 1 andl securedto said; supporting means,

Wherebyto attach said rings to said supr porting means and Contract saidopenings for lockingthe bushings in place.

3. A piston comprising an imperforate skirt and a head, a- Wrist pinring having aligned bearing openings, said skirt having inner supportingmeans for attachment thereto of said ringfand a. disk interposed:between said ring and said supporting mea-ns to form aclosed space insaid hea-d.

In Witness that Ir claim the foregoing I have hereunto subscribed myname this 5th day of May, 1921.v I

JOHN IV.y CORSER.

